Sand blasting apparatus



Nov. 21, 1933. w L, SCHULENBERG' 1,935,956

SAND BLASTING APPARATUS Filed June 9, 1931 3 Sheets-Sheet l INVENTORWf/liam L. 50/1 u/enZerg :2 BY ATT EY 1933- w. L. SCHULENBERG SANDBLASTING APPARATUS Filed June 9, 1931 5 Sheets-Sheet 2 INVENTOR.sclqu/enZel? ATTOR Y 5 Shets-Sheet a RNEY .w. L. S CHULENBERG SANDBL'ASTING APPARATUS Filed June 9, 193;

Nov, 21, 1933.

Patented Nov. 21, 1933 e v 1,935,956 A SAND BLASTING APPARATUS WilliamL. Schulenberg, Fredonia, N. Y. 7 Application June 9, 1931.. Serial No.543,084 3 Claims.. (01. 51-14) 'This invention relates ,to sand.blasting apparatus. An object ofthe invention is to provide an apparatusfor sand blasting pipes and other cylindrical objects, which willcomprise an eflicient motor operated mechanism for mechanically movingthe work to be treated and the movable units of the blasting apparatus.Other and further objects of and advantages achieved by the instantinvention will be apparent from the following description of a.preferred embodiment of the invention.

In the accompanying drawings Figure 1 is a longitudinal sectionalv Viewof the foundation and housing of the instant invention, with themechanism of the'invention shown in elevation; Fig. 2 isa plan View ofFig. l, with the housing cover removed; Fig. 3 is a section on the lineI IIIII of Fig. 1; Fig. 4 is a section on the line IVIV of Fig. 1; Fig.5 is an enlarged side view of the bearing and feeding mechanism for oneof the sand blast pipe constructions; Fig. 6 is an .end view of Fig. 5;Fig. '7 is a'side view of a modified form of sand blast pipeconstruction embodying a strengthening truss rod;- and Fig.

' .8. is an enlargedend view of a modified form of bearing for the blastpipe construction of Fig. 7. .Referring in detail to the drawings, thefoundation for the structure of the instant invention comprises concreteflooring, indicated generally by the numeral 1, front and rear walls 2and 2a, respectively, an intermediate wall-12b, parallel to the frontand rear walls, side walls 3 and 3a. an intermediate wall 31), betweenthe side walls and parallel thereto, a supporting floor outwardlyextending from the upper end of the wall 3, and upwardly extendingsupporting projections la. The top of the flooring 1', slopes at 11),from the rear wall 2a, toward the wall 21), leaving a horizontal portion10, adjacent the wall 2b. A pit is centrally formedin the flooring 1,between the Walls 3 and 3b, transversely across the foundation. The pitcomprises downwardly extending side walls 5 and a floor 6 connecting theside walls. The front and rear walls 2 and 2a extend downward to thefloor16, at the front and rear ends of thepit. A perforated floor plate7 is disposed across the top of the pit between the walls 2a and 2b, anda worm conveyore of usual construction supported on the floor 6. At therear end of the conveyor a belt bucket elevator 9 is provided. Theelevator 9. is of usual constructioncomprising arubber belt 10, havingbuckets 11, attached thereto, and is carried by an upper pulley l2and'alowerpulley13. A

adjacent ends of the shafts 25 and 24. This end bearing 40 is adjustablewith the bearings 27.

motor 14 is provided adjacent the upper pulley 12 and is geared theretofor driving it. The lower pulley 13 is keyed tothe shaft of the wormconveyor 8, so that the motor 14 simul--, taneously operates both theelevator and conveyor. spouts l5 and 16, for conveying abrasive, areextended from the upper end of the elevator downwardly to a pair ofabrasive separators and cleaners 17 and 18 of usual type andconstruction which are supported on blast tanks 42 and 43, hereinaftermore fully described, between the walls 2 and 22). A dust.- exhauster 19is mounted adjacent the upper ends 'of the spouts 15 and 16. The dustexhauster is of a well known type and operates to remove dust and fineparticlesfrom the abrasive as it leaves the elevator. A separator 21 isconnected to the exhauster 19 by a duct 22. The separator is likewise ofa well known type, and acts to exhaust the free air into the atmosphereand deposit the solids in a suitable receptacle (not shown) beneath theseparator. A motor 23 is engaged with the exhauster for operating thesame.

A pair of horizontal parallel shafts 24 and 25 are mounted in bearings26 and 27 respectively,

which are supported on the projections 1a of. the floor ofthefoundation. Rollers 28 and 29 are keyed to the shafts 24 and 25respectively, the

outer rollers on the shaft 24 bein'gprovided with 8 flanges 30 and beinglongitudinally adjustable on said shaft. The bearings 27, are held inslotted guides 31, by bolts 32, and are adapted to be moved in saidguides for the lateral adjustment of the shaft 25 A motor 33 is providedbetween the. walls. 3a and 3b. The motor 33 is geared v to a speedreducer 34, which drives a shaft'35 having bevelled gears 36 and 37keyed thereto. The gears 36 and 37 mesh with bevelled gears 38and 39respectively, which are keyed to the of the shaft 25 is carried inabearing 40, which is held by bolts in slotted guides 41, so that the Thebevelled gear 36 is slidably adjustable on the shaft 35 so as tobemaintained in mesh with the gear 38, when the shaft 25 is laterallyadjusted. The rollers 28 and 29 are thus adapted to be rotated by themotor 33, in all "of their relative adjusted positions.

. Beneath the separators and cleaners 17 and 18 are disposed sand blasttanks 42 and 43, respectively, which are connected together and areofthe usual type and construction. The tanks are supplied with air underpressure in the usual manner (not shown), receive the abrasive from thetanks 1'? and 18, and feed the abrasive to pipes 44 and 45, respectivelyconnected thereto. The pipes a4 and 45 extend to the outer ends of theapparatus, and are respectively connected to hoses 46 and 47. Theopposite ends of the hoses are respectively connected to pairs of sandblast pipes .6 and 49 having nozzles 48a and 49a of ordinary type andconstruction fitted at their free ends. The pipes of each pair arespaced apart so that their nozzles will be disposed, one adjacent theinner side and one adjacent the outer side, of a pipe 65 to be treated,hereinafter referred to.

Each of the sand blast pipes is covered by a metal housing 50 (Figs. 5and 6) which is square in cross-section. Each pipe and its housing issupported by an inner bearing 51 and outer hear: ing 52. The bearingsare supported on the foundation of the apparatus. The inner bearingscoll prise yokes 53 in which spaced bearing wheels 54 are journalled,the sand blast pipes and the housings being passed between the bearingwheels 54 and held in position by their hearing faces. The outerbearings 52 embody feed mechanism for the sand blast pipes. The outerbearings (Figs. 5 and 5) comprise yolies 55 in which spaced bearingwheels 56 are journalled similarly to the bearing wheels st in the yokes53 and the sand blast pipes and their housings also pass between thebearing wheels 56 and are held in position thereby.

'Chain drive wheels 57 are journalled in the yokes 55 beneath the lowerbearing wheels 56. At each end of the apparatus, a reversible motor 58is provided. The chain drive wheels 5'7 for both of the outer bearings52 at each of the opposite ends of the apparatus are keyed to commonshafts 59 and the shafts 59 are geared to their adjacent motors 58. Atthe opposite ends of each of the blast pipes, chains 60 are connected,the chains passing over the lower bearing wheels 55, and around thechain drive wheels 57 of the outer bearing in each instance, so that themotors 58 will move the sand blast pipes and their housings inwardly andoutwardly through their bearings, accordingly as the motors are drivenjiorwardly or in reverse. An enclosure indicated generally by thenumeral 61 is supported on the foundation and surrounds the rollermechanism. The enclosure comprises four walls 62 and is provided with asuitable door 63 and a removable cover 64. Openings in. the end walls ofthe enclosure permit thepassage therethrough of the sand blast pipesdsfand (i9. A suitable crane (not shown) is provided for removing thecover 64 and for lifting the pipe or object 65 to be operated upon, intoand out of position within the housing.

In Fig. '7 there is illustrated a modified form of sand blast pipe andhousing structure. In this instance the blast pipe 66 is of relativelygreat length. It is provided with a housing 6'7 similar to the housing50 and a strengthening truss 68 is welded to its opposite ends at 69,and connected thereto intermediate the ends by struts 70.

In Fig. 8there is illustrated a modified form of bearing for thestructure illustrated in Fig. '7. Here the lower bearing wheel is thesame as the lower bearing wheel 56 of the bearing 52, but the upperbearing wheel means comprises two separate bearing wheel portions 71 and72 which are separately journalled to the sides of the bearing yoke 73and leave a space between them through which the truss rod of themodified form of blast pipe and housing structure is permitted to pass.'Where the truss rod embodiment of the blast pipe is used the upperbearing wheel means in both the inner and outer bearings will both be ofthe modified construction last described.

In the operation of the apparatus the cover 6% of the housing will firstbe removed by the crane, and the pipe 65 to be sand blasted will belifted to working position on the rollers 28 and 29, the end rollers onthe shaft 24, and the shaft 25 having been previously adjusted tosuitable relative positions according to the dimensions of the pipe. Thecover 64 will then be replaced on the enclosure and the motor 33 will bestarted, the rollers 28 and 29 being turned thereby and the pipe 65being rotated around its longitudinal axis. The flanges 30 on the outerrollers of the shaft 24 will prevent creep or longitudinal movement ofthe pipe 65 during its rotation. The motors 14 and 23 will likewise bestarted thus causing the worm 8, the elevator 9 and the dust exhauster19 to be brought into operation. The tanks 42 and 43 will be suppliedwith compressed air in the usual manner and the abrasive will be fed tothe nozzles. The motors 58 will then be started and the blast pipes andtheir nozzles will be moved inwardly and outwardly,'that is to say, whenthe nozzles have travelled from the outer ends of the pipe inwardly tothe center of the pipe, the motors 58 will be reversed and the pipes andtheir nozzles will travel outwardly back again-to the outer ends of thepipe, theoperation being repeated until the pipe has been blasted to theextent desired. The nozzles at each end of the 1;.10 apparatus beingdisposed one on the inside of the pipe and one on the outside, both theinner and outer surfaces of the pipe will be blasted at the same time.The used abrasive will be swept or otherwise suitably deposited into thepit. The 115 worm 8 will carry used abrasive collected in the pit to theelevator 9 which in turn will deliver the same to the tanks 1'7 and 18,while dust collector draws off the useless fine particles of theabrasive or dust at the top of the conduits 15 and 16, and 120 deliversthe fine particles or dust to the separator 21 which discharges the freeair to the atmosphere and the solids separated therefrom to thecontainer beneath the same.

While there has been hereinbefore described 125 specific embodiments ofthe instant invention it will be understood that many and variouschanges in procedure and details of constructionmay be made by thoseskilled in the art without departing from the spirit of the invention,and that all 1 30 and any such changes and modifications as fall withinthe scope of the appended claims are contemplated as a part of theinstant invention.

The invention claimed and desired to be secured by Letters Patent is:135

1. An abrasive blasting apparatus comprising means for movablysupporting an object to be treated; a source of abrasive; a blastingpipe adjacent said supporting means, connected with said source; anozzle at an end of saidpipe; a housing 1481 around said pipe,substantially square in cross section; a support for said pipecomprising a pair of spaced aligned rollers adapted to engage saidhousing; and means connected with said housing for longitudinally movingsaid pipe and 45 housing between said rollers to .vary theposition ofsaid nozzle.

2; An abrasive blasting apparatus comprising means for movablysupporting anobject to be treated; a source of abrasive; a blasting pipeadjacent said supporting means, connected with said source; a nozzle atan end of said pipe; a housing around said pipe, substantially square incross section; a support for said pipe comprising a pair of spaced,aligned rollers adapted to engage said housing; a chain connected at itsends with said housing; and a chain drive wheel operably engaging saidchain for longitudinally moving said housing and pipe to vary theposition of said nozzle.

3. An abrasive blasting apparatus comprising means for movablysupporting an object to be treated; a source of abrasive; a blastingpipe adgage said housing; a chain connected at its ends with saidhousing; a chain drive wheel operably engaging said chain forlongitudinally moving said housing and pipe to vary the position of saidnozzle; and a reversible motor operably engaged with said chain drivewheel.

WILLIAM L. SCHULENBERG.

